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      <div class="body-wrap"><article id="post-node-httpproxy" class="article article-type-post" itemscope itemprop="blogPost">
  
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      Use Node.js To Implement HTTP Proxy
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        <h2 id="Demand"><a href="#Demand" class="headerlink" title="Demand"></a>Demand</h2><p>When I have username and password to simulate a login action on a website, how can I pass the verification algorithm or validation routines, sometimes this kind of program is really complicated which is the biggest obstacle to hack in. For instance, when you have plenty <a href="https://login.m.taobao.com/login.htm" target="_blank" rel="noopener">Taobao</a> usernames and passwords how can you figure out what the customer bought, as this b2c mogul uses an algorithm to check all http request if they are legal.<br><a id="more"></a></p>
<h2 id="Analysis"><a href="#Analysis" class="headerlink" title="Analysis"></a>Analysis</h2><p>We need that signature program to disguise our http request.</p>
<p>before we dig it out from the website we really need a workstation to do some experiments as a handy tool may save us loads of time. The longer answer is that we could use http proxy to falsify a normal http request and to verify our speculation.</p>
<h2 id="Tools-amp-Implementation"><a href="#Tools-amp-Implementation" class="headerlink" title="Tools &amp; Implementation"></a>Tools &amp; Implementation</h2><p>Chrome<br>SwitchyOmega chrome plugin<br><a href="https://github.com/jrburke/requirejs" target="_blank" rel="noopener">requirejs</a>.</p>
<p>With switchyOmega we can get a proxy server interface locally, use 127.0.0.1 and a specific port, let’s say 8000.</p>
<p>Now, all the requests will pass through this port before rendered by the browser.</p>
<p>Download requirejs, we need it to load our js in local.</p>
<p>What we need then is to run a http server instance to do our own secret business, it is time to shine a spotlight on the nodejs server and some scripts. </p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">*	proxy.js</span></span><br><span class="line"><span class="comment">**/</span></span><br><span class="line"><span class="keyword">var</span> sys = <span class="built_in">require</span>(<span class="string">"sys"</span>);</span><br><span class="line"><span class="keyword">var</span> http = <span class="built_in">require</span>(<span class="string">"http"</span>);</span><br><span class="line"><span class="keyword">var</span> fs = <span class="built_in">require</span>(<span class="string">'fs'</span>);</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  User defined module containing the special handlers</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"><span class="keyword">var</span> special_handler = <span class="built_in">require</span>(<span class="string">"./handlers"</span>);</span><br><span class="line"><span class="comment">// var special_handler = require("C:/Users/pc/Desktop/handlers");</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  ignore common connection errors like broken pipes.</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line">process.on(<span class="string">'uncaughtException'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">err</span>) </span>&#123;&#125;);</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  Default handler. Proxy the requests that don't match the patterns</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"><span class="keyword">var</span> proxy_handler = <span class="function"><span class="keyword">function</span>(<span class="params">response, data</span>) </span>&#123;</span><br><span class="line">    response.write(data, <span class="string">'binary'</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  This is the Request Handler function for the server.</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"><span class="keyword">var</span> requestHandler = <span class="function"><span class="keyword">function</span>(<span class="params">clientRequest, clientResponse</span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">    sys.puts(<span class="string">"Request: "</span> + clientRequest.url);</span><br><span class="line">	</span><br><span class="line">	<span class="keyword">if</span>(clientRequest.url.indexOf(<span class="string">'lib-yocto'</span>)&gt;<span class="number">0</span>)&#123;</span><br><span class="line">		fs.readFile(<span class="string">'./taobaof.js'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">err, data</span>) </span>&#123;</span><br><span class="line">			<span class="keyword">if</span> (err) <span class="keyword">throw</span> err;</span><br><span class="line">			<span class="built_in">console</span>.log(<span class="string">'just here\n\n\n\n\n\n'</span>);</span><br><span class="line">			clientResponse.setHeader(<span class="string">'content-type'</span>,<span class="string">'application/x-JavaScript'</span>);</span><br><span class="line">			clientResponse.write(data);</span><br><span class="line">			clientResponse.end();</span><br><span class="line">		&#125;);</span><br><span class="line">		<span class="keyword">return</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Create the client */</span></span><br><span class="line">    <span class="keyword">var</span> proxy = http.createClient(<span class="number">80</span>, clientRequest.headers[<span class="string">'host'</span>])</span><br><span class="line">    <span class="comment">/* Do the request */</span></span><br><span class="line">    <span class="keyword">var</span> client = proxy.request(clientRequest.method, clientRequest.url, clientRequest.headers);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Handle on response event */</span></span><br><span class="line">    client.on(<span class="string">"response"</span>, <span class="function"><span class="keyword">function</span>(<span class="params">response</span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">        sys.puts(<span class="string">"Status Code: "</span> + response.statusCode);</span><br><span class="line"></span><br><span class="line">        clientResponse.writeHeader(response.statusCode, response.headers);</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* By Default the handler is proxy_handler */</span></span><br><span class="line">        handler = proxy_handler;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/**</span></span><br><span class="line"><span class="comment">         * Process the user defined patterns and handlers</span></span><br><span class="line"><span class="comment">         * */</span></span><br><span class="line">        <span class="keyword">for</span> (hand <span class="keyword">in</span> special_handler.handlers) &#123;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (clientRequest.url.search(special_handler.handlers[hand].pattern) != <span class="number">-1</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                handler = special_handler.handlers[hand].action</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* Write the response data while receive */</span></span><br><span class="line">        response.on(<span class="string">'data'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">data</span>) </span>&#123;</span><br><span class="line">            handler(clientResponse, data);</span><br><span class="line">        &#125;);</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* Close the connection */</span></span><br><span class="line">        response.on(<span class="string">"end"</span>, <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">            clientResponse.end();</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Write the request data while receive */</span></span><br><span class="line">    clientRequest.on(<span class="string">"data"</span>, <span class="function"><span class="keyword">function</span> (<span class="params">chunk</span>) </span>&#123;</span><br><span class="line">        client.write(chunk, <span class="string">'binary'</span>);</span><br><span class="line">    &#125;);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Close the connection */</span></span><br><span class="line">    clientRequest.on(<span class="string">"end"</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">        client.end();</span><br><span class="line">    &#125;);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  Create and run the server!</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"><span class="keyword">var</span> server = http.createServer(requestHandler);</span><br><span class="line">server.listen(<span class="number">8000</span>);</span><br><span class="line">sys.puts(<span class="string">"Server running at http://127.0.0.1:8000/"</span>)</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">*	handlers.js</span></span><br><span class="line"><span class="comment">**/</span></span><br><span class="line"></span><br><span class="line">exports.handlers = [&#123;</span><br><span class="line">    pattern: <span class="string">'facebook'</span>,</span><br><span class="line"></span><br><span class="line">    action: <span class="function"><span class="keyword">function</span>(<span class="params">response</span>) </span>&#123;</span><br><span class="line">        response.writeHead(<span class="number">200</span>, &#123;</span><br><span class="line">            <span class="string">'Content-Type'</span>: <span class="string">'text/html'</span></span><br><span class="line">        &#125;);</span><br><span class="line">        response.end(<span class="string">"&lt;h1&gt;Ups, Sorry. &lt;br/&gt;&lt;br/&gt; I Like Facebook but I Block it... &lt;br/&gt;&lt;br/&gt; Please Contact the Administrator &lt;/h1&gt;"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;];</span><br></pre></td></tr></table></figure>
<p>As above scripts block facebook and show a message to manifest our workstation is built up .</p>
<p>Finally, it’s time to use chrome to open a login web page of the website - <a href="https://login.m.taobao.com/login.htm" target="_blank" rel="noopener">https://login.m.taobao.com/login.htm</a>. Listen all the http &amp; https requests and analyse &amp; verify the signature program.</p>

      
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